Thread: 135i Turbo Engine (N54 / N55) *General Questions Thread*
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      11-17-2010, 12:22 PM   #98
Kcc
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Drives: 4 Wheels with a turbo
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Does changing the midpipe to "high flow" cats on stock downpipe and axleback gets you any gains and sound? How much different would I be getting?

Kcc
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